I know for sure that is the problem about inside out
beacuse i craet a defult uber area light sphere
and i set the sphere's scale -100 but its still lighting
so how can i do then i can revers the surface
see the picture

It is working correctly for me. Be sure that you have ambient checked ON in the surface tab by the way or the inside of the sphere will remain black even though the figure is lighted. Also be sure to adjust the intensity or you will get little or no lighting on the figure. I'll post a render shortly.

It is working correctly for me. Be sure that you have ambient checked ON in the surface tab by the way or the inside of the sphere will remain black even though the figure is lighted. Also be sure to adjust the intensity or you will get little or no lighting on the figure. I'll post a render shortly.

yeah i already checked ON the ambient
if you didt check on then the whole image you render will drak
if you checked ON then you can see the background
but the figure still dark if u put the figure inside the sphere
because the normal of lighting is outside whatever u set the scale -100 or +100

I'm using 4.5. Are you raising the intensity on the surface tab high enough? For the render I have going I raised it to 700 because it is a pretty dark image and suspect I could have gone higher. It would depend on what additional light I planned for the scene.

Hmm.. We know you have an inside out sphere (due to the -100 scale) and that the figure is inside the sphere. You have ambient turned on and the image in all 3 places it belongs. If turning up the intinsity to 1000 still does not light the figure that is really odd. Which version of studio 4.5 are you using?

I think there is something wrong in this version. But.. I don't think it is the uber surface light that is the issue since I could get it to work on a different primitive. I have no clue in the world what is going strange with the sphere though.